The Ministers-Presidents of the Flemish government, the Walloon government, the government of the French Community, the government of the German-speaking community and the government of the Brussels-Capital Region also take the oath of office to the king. The other members of these governments do not swear an oath to the king, but to their respective parliaments. The outbreak of the civil war quickly turned the routine oath into a major importance. In April 1861, a period of uncertain and changing loyalty, President Abraham Lincoln ordered all civilian employees of the Confederacy in the executive branch to take an expanded oath. When Congress met urgently in July, members joined the president`s action by passing laws requiring workers to take the expanded oath of support for the Union. This oath is the first direct predecessor of the modern version of the oath. In Belgium, the king is not crowned, but swears the constitutional oath before both houses of the Federal Parliament at the Palais de la Nation in Brussels in all three official languages: there are places where there is confusion between the „oath” and other statements or promises. For example, the current Olympic oath is truly a promise, not a true oath, since there is only one promise, but there is no call for holy testimony. The oath can also be mistaken for vows, but vows are really just a particular kind of oath. The first person in the biblical tradition to take the oath was Eliezer, the supreme servant of Abraham, when he asked the first to take a woman not for his son Isaac from the daughters of Canaan, but from the family of Abraham.
The oaths of state and municipal officials are largely due to the oath of allegiance to the Federal Constitution. The oath of all New York government officials would be typical: making vows and taking an oath has become a symbolic concept in legal practice that has developed over time in different cultures. In Italy, before taking office, Article 91 of the Constitution obliges the President to swear allegiance to the Republic and to swear, in a joint meeting before Parliament, to maintain the Constitution.  The presidential oath is as follows: Islam takes the fulfillment of oaths very seriously. As required by the decision, the oath is as follows (as amended in 2018): in Costa Rica, the oath is awarded to the President-elect on inauguration day and to all other officials on the day of the completion of their duties. The oath of the President of Costa Rica is taken from him by the president of the Asamblea Legislativa of Costa Rica. It is enshrined in the political constitution of the Republic of Costa Rica (Article 194): the oath of the Prime Minister and other members of the Council of Ministers of the Union: 1.